若数据无投影，则不显示投影

application/default/views/scripts/data/view.phtml

@@ -59,6 +59,7 @@ echo '</ul></div>';
 	<li id="downtimes">下载：<?php echo $this->downloaded; ?>次</li>
 	<?php endif; ?>
 	<li id="viewtimes">浏览量：<?php echo $this->viewed; ?>次</li>
+<?php if ($this->projection) : ?>	
 	<li id="projection" title="<?= $this->projection; ?>">数据投影：
 <?php
 $p=explode(" ",$this->projection);
@@ -71,6 +72,7 @@ else
  echo $md->projection; 
 }
 ?></li>
+<?php endif; ?>
 	<?php if (!empty($md->timebegin)) : ?>
 	<li id="datatimes">数据时间范围：<?php echo date('Y-m-d',strtotime($md->timebegin));if (!empty($md->timeend)) echo " 至 ".date('Y-m-d',strtotime($md->timeend)); ?></li>
 	<?php endif; ?>